For the 3H4 film, the occurrence of strain hardening
also plays an important role in deciding the width profile.
The stress-strain behaviors of samples change from strain hardening
to strain softening with dry density increasing.
Comparison of the constant K specified in the material of the sheets of the material DC 04 with the measured values obtained for the examined materials of the F-M steels (Table 2) show that the constant K (K = 1052 - 1336 MPa) of all materials was higher that of a steel sheets DC 04 and the values of the strain hardening
exponent of materials produced by intercritical annealing were greater or comparable with the DC 04.
We have found that the Strain Hardening
test delivers reproducible results which very nicely correlate with results of time-consuming traditional slow crack growth tests -- but in a much shorter time," says Frans Scholten, expert on material testing at Kiwa Technology.
Two ways to accomplish the objective include (1) adding wall thickness and (2) developing tube and fitting processes that would enhance strain hardening
while minimizing deformation due to increased hoop stress.
The strain hardening
during metal forming has also a great influence on the elastic recovery ratio.
The new strain hardening
method can be easily implemented at accredited laboratories, says SABIC, and the company anticipates that it will become the standard for HDPE slow crack growth testing.
The thermal softening and strain hardening
values predicted by the ZA model are incorrect as found by Jaspers [10, 17].
1] are observed, indicative of a very slight strain hardening
, again attributed to its bimodal molecular weight distribution.
curves (see Figures 4 and 5 in No.
When the polymer is considered linear, meaning that the polymer chains are free from any branch points, the stretching of the sample will be uniform and no strain hardening
is observed because the chains are not prevented from slipping over each other.
This difference could be due to the differences in strain hardening
of octene based EAO copolymers versus butene based EAO copolymers, it has been postulated that this increase in strain hardening